/Engine/Source/Runtime/Slate/Public/Framework/Text/TextLayout.h
struct FTextLayoutSize
float
DrawWidth
Width of the text layout, including any lines which extend beyond the wrapping boundaries (eg, lines with lots of trailing whitespace, or lines with no break candidates)
float
Height
Height of the text layout
float
WrappedWidth
Width of the text layout after the text has been wrapped, and including the first piece of trailing whitespace for any given soft-wrapped line